So, the area is approximately equal to one half of the area of a parallelogram that I could form from these vectors.
这面积，约等于平行四边形的一半，我能用向量表示它。
r So, let's remember that the amount by which we moved, t delta r, is approximately equal to v times delta t, OK, and just using the definition of a velocity vector.
所以记住移动的量△,约等于v*△,这是用速度矢量的定义。
As shown, the earth's mean radius is about 6378 km, while the altitude and orbit radius of a GSO satellite is approximately equal to 35786 km and 42164 km respectively.
由静止卫星的轨道位置示意图可见，地球的平均半径约为6378公里，静止卫星的轨道高度约为35786公里，轨道半径约为42,164公里。
As shown, the earth's mean radius is about 6378 km, while the altitude and orbit radius of a GSO satellite is approximately equal to 35786 km and 42164 km respectively.
由静止卫星的轨道位置示意图可见，地球的平均半径约为6378公里，静止卫星的轨道高度约为35786公里，轨道半径约为42,164公里。
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